COMMITMENTS AND CONTINGENCIES - Maturity analysis of operating lease liabilities (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
COMMITMENTS AND CONTINGENCIES
Within one year	$ 118,000	$ 148,000
After one but within two years	94,000	106,000
After two but within three years	68,000	86,000
After three but within four years	68,000	68,000
After four but within five years	68,000	68,000
After five years	2,275,000	2,326,000
Total undiscounted cash flows	2,691,000	2,802,000
Discount on cash flows	(1,156,000)	(1,139,000)
Total lease liability	1,535,000	1,663,000
Finance Lease, Minimum Lease Payments due:
Within one year	13,000	0
After one but within two years	13,000	0
After two but within three years	12,000	0
After three but within four years	3,000	0
After four but within five years	3,000	0
After five years	6,000	0
Total undiscounted cash flows	50,000	0
Discount on cash flows	(2,000)	0
Total lease liability	$ 48,000	$ 0